package org.jeecg.modules.wangyue.utils;

import java.awt.geom.Point2D;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

/**
 * 地点工具
 */
public class LocationUtils {

    private static double EARTH_RADIUS = 6378.137;
    private static double rad(double d) {
        return d * Math.PI / 180.0;
    }


    /**
     * 通过经纬度获取距离(单位：米)
     *
     * @param lat1
     * @param lng1
     * @param lat2
     * @param lng2
     * @return 距离
     */
    public static double getDistance(double lat1, double lng1, double lat2,
                                     double lng2) {
        double radLat1 = rad(lat1);
        double radLat2 = rad(lat2);
        double a = radLat1 - radLat2;
        double b = rad(lng1) - rad(lng2);
        double distance = 2 * Math.asin(Math.sqrt(Math.pow(Math.sin(a / 2), 2)
                + Math.cos(radLat1) * Math.cos(radLat2)
                * Math.pow(Math.sin(b / 2), 2)));
        distance = distance * EARTH_RADIUS;
        BigDecimal decimal = new BigDecimal(distance*10000);
        distance =decimal.setScale(2,BigDecimal.ROUND_HALF_UP).doubleValue()/10000;
        return distance * 1000;
    }


    public static void main(String[] args) {
        System.out.println(getDistance(22.623206, 114.145651, 22.624254, 114.147431));
    }


}